Group Pricing Question

[Ajeh]

This is the whole function process:

  function process() {
    global $order, $currencies, $db;
    $order_total = $this->get_order_total();
    $od_amount = $this->calculate_deductions($order_total['total']);
    $this->deduction = $od_amount['total'];
    if ($od_amount['total'] > 0) {
      reset($order->info['tax_groups']);
      $tax = 0;
      while (list($key, $value) = each($order->info['tax_groups'])) {
        if ($od_amount['tax_groups'][$key]) {
          $order->info['tax_groups'][$key] -= $od_amount['tax_groups'][$key];
          $tax += $od_amount['tax_groups'][$key];
        }
      }
      if ($od_amount['type'] == 'S') $order->info['shipping_cost'] = 0;
      $order->info['total'] = $order->info['total'] - $od_amount['total'];
      if (DISPLAY_PRICE_WITH_TAX == 'true') {
        $od_amount['total'] += $tax;
      }
      if ($this->calculate_tax == "Standard") $order->info['total'] -= $tax;
      if ($order->info['total'] < 0) $order->info['total'] = 0;
      $order->info['tax'] = $order->info['tax'] - $tax;

    $group_query = $db->Execute("select customers_group_pricing from " . TABLE_CUSTOMERS . " where customers_id = '" . (int)$_SESSION['customer_id'] . "'");
    $group_discount = $db->Execute("select group_name, group_percentage from " . TABLE_GROUP_PRICING . "
                                      where group_id = '" . (int)$group_query->fields['customers_group_pricing'] . "'");
      $this->output[] = array('title' => $this->title . ':'  . ' ' . $group_discount->fields['group_name'],
      'text' => '-' . $currencies->format($od_amount['total'], true, $order->info['currency'], $order->info['currency_value']),
      'value' => $od_amount['total']);

    }
  }